Pilot bearing sizes

SOFTPICKLE

MEMBER
2000 JEEP WRANGLER TJ
4.0L
6 CYL
4WD
MANUAL
100,000 MILES

Currently I am working on the vehicle listed above. The original engine threw a rod through the oil pan so I am working in installing a 4.0 that was removed from a 2003 Jeep TJ. The issue that I have is that the newer engine came out if an automatic and is going to be mated with a manual. I believe the transmission I am mating the engine to is the nv3550 five speed.

When I went to O'Reilly's and got the pilot bearing, it called for bearing part number FC-69907. When looking at installing this bearing, it appears that the bearing is too big to be pressed into the end of the crank.

Does anyone know if there is a second pilot bearing size for these Jeeps? I have read a few forums that talk about manual and automatics using different size crank ends. This has also got me wondering if I should use a pilot bushing instead of a bearing as well. Any help you all have is appreciated.

7 Replies

STEVE W.

MECHANIC
13,474 POSTS

There are two different sizes. The small one is one inch in diameter with a.75" bore and the large one is 1.86" in diameter with a.75" bore.
The one you have is the large version.
You need a Timken or National #SCE1295.

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Monday, July 31st, 2017 AT 12:45 PM

SOFTPICKLE

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Okay. Thank you very much for your help.

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Monday, July 31st, 2017 AT 1:02 PM

SOFTPICKLE

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When I looked up the part number, I fount it is just the bearing. I will be needing the sleeve the bearing goes into as well or does this bearing get installed deep into the crankshaft end?

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Monday, July 31st, 2017 AT 1:05 PM

STEVE W.

MECHANIC
13,474 POSTS

Measure the diameter of the pilot bore, that is the only way to be sure which one you need. The crank is bored to fit one or the other.

Here is a guide that will help you.

https://www.2carpros.com/articles/pilot-bearing-replacement

Cheers,

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Monday, July 31st, 2017 AT 2:54 PM

SOFTPICKLE

MEMBER
21 POSTS

Just an update, after pulling the original blown engine from the Jeep, I found out the replacement engine has an extension sleeve pressed into the end of the crankshaft for the automatic transmission it was matted with original before it was removed and we purchased it. It came out easily with a pilot bearing puller and the pilot bearing I had fit in its place. Thank you for your help.